Extended Data Table 2 Covariates used to perform site matching

From: Protected areas have a mixed impact on waterbirds, but management helps

  1. First, the three categorical variables (anthrome, region and migratory status) were used for exact matching. Next, all continuous variables were assessed for collinearity and highly collinear variables were removed. The remaining continuous variables were used to calculate mahalanobis distance. Data sources: refs. 75,76,77,78,79,80,81,82,83,84.
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